Useful Tricks in QT

• qPrintable(QString str) - skips the several function calls it usually takes to get to a standard char*
• .pro file basics
• Need to include a header from a new directory?
• INCLUDEPATH += /path/to/directory/
• HEADERS += myheader.h
• #include <myheader.h> in the file you are working on.
• For some reason, it took a while for the header to be recognized. I reran qmake and tried rebuilding a few times. This may not always happen.
• update: i think the reason the header was not recognized was that I had misspelled it. Whoops! Once INCLUDEPATH and HEADERS were updated, the header appeared in the autocomplete.
• Random Numbers
• call the following first and only once: qsrand(QDateTime::currentDateTime().toTime_t());
• to get a random number 0..max, do something like the function below
• qint32 randNum(qint32 max)
  {
  return ((qreal)qrand())/RAND_MAX * max;
  }
  

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